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- Title
ANTINEOPLASTIC MULTI-DRUG CHEMOTHERAPY TO SENSITIZE TUMORS TRIGGERS MULTI-DRUG RESISTANCE AND INHIBITS EFFICIENCY OF MAINTENANCE TREATMENT IN GLIOBLASTOMA CELLS.
- Authors
Doğanlar, Oğuzhan; Doğanlar, Zeynep Banu; Erdoğan, Suat; Delen, Emre
- Abstract
Combinations of the well-known antineoplastic agents 5-fluorouracil (5-Fu), cisplatin, and paclitaxel are employed to increase radiotherapy/immunotherapy efficacy against persistent and resistant tumors. However, data remains needed on the hormetic, chronic, and long-term side effects of these aggressive combination chemotherapies. Here we investigated cellular and molecular responses associated with these combined agents, and their potential to induce multi-drug resistance against the temozolomide (TMZ) and etoposide (EP) used in glioblastoma maintenance treatment. We analyzed resistance and survival signals in U87 MG cells using molecular probes, fluorescent staining, qRT-PCR, and immunoblot. Repeated treatment with combined 5-Fu, cisplatin, and paclitaxel induced cross-resistance against TMZ and EP. Resistant cells exhibited elevated gene/protein expression of MRP1/ABCC1, ABCC2, BRCP/ABCG2, and GST. Moreover, they managed oxidative stress, cell cycle, apoptosis, and autophagy signaling to ensure survival. In these groups TMZ and etoposide efficiency dramatically reduced. Our result suggests that combined high-dose treatments of classical antineoplastic agents to sensitize tumors may trigger multi-drug resistance and inhibit maintenance treatment. When deciding on antineoplastic combination therapy for persistent/resistant glioblastoma, we recommend analyzing the long-term hormetic and chronic effects on cross-resistance and multi-drug resistance in primary cell cultures from patients.
- Subjects
MULTIDRUG resistance; GLIOBLASTOMA multiforme; ANTINEOPLASTIC agents; PACLITAXEL; CANCER chemotherapy; MOLECULAR probes; TEMOZOLOMIDE
- Publication
EXCLI Journal, 2023, Vol 22, p35
- ISSN
1611-2156
- Publication type
Article
- DOI
10.17179/excli2022-5556